Abstract : Infection and a lack of micronutrients are what prevent plants from thriving in toddler. The reason of this find out about was once to analyze infection and micronutrient supplementation on the Z rating of young people with failure to thrive. An experimental with Pretest Posttest Group Design was carried out on sixty-nine children aged 12-23 months who, for two months, were observed to gain less than the 5th percentile of WHO standard weight increment, selected with the aid of consecutive sampling and stay in the coastal area of the city of Semarang. The supplementation intervention was given to three groups in a double- blind manner: 1) Zn sulfate syrup 10 mg; 2) iron syrup 7.5 mg + vitamins B complex; 3) Zn sulfate syrup 10 mg and iron syrup 7.5 mg + vitamins B complex. The research was once carried out for two months. The lookup instrument used a questionnaire, baby scale, infantometer, WHO Antro, nutrisurvey. Statistical test using paired T-test, multivariate analysis of variance, and dummy variable logistic regression. The Paired T-Test confirmed that there used to be a sizable difference in the Z Score in WHZ in the two supplementation groups (p=0.014). The MANOVA test concurrently for the three groups affected the Z Scores of WAZ, HAZ and WHZ (p=0.001). Post Hoc evaluation determined that the Z score of WHZ in group two used to be one-of-a-kind from team 1 (p=0.001) and group 3 (p=0.011). Micronutrient supplementation influences the Z Score of WHZ in children who fail to thrive. The Dummy Variable Logistic Regression found that the incidence of URI affected WHZ.